AITRIP4pack Pro Micro ATmega32U4 5V/16MHz Module Board with 2 Row pin Header for arduino Leonardo Replace ATmega328 Pro Mini (4 Pack)

The USB ports on these are a little fragile. If it will be used in a situation where there is any potential for strain on the port, I would recommend going for one of the brands with a reinforced port. Hopefully the manufacturer considers reinforcing it in future.However, the seller / manufacturer was quick to refund me the value of the board that failed. Great customer service.

My brother and I were re-learning how to solder and found a fun project to make our own low-profile open-source keyboards. The keyboard project required this form-factor of board, and these were the more money conscious options out there.The micro-USB interface isn't ideal for long-term use, as it was recommended to me to make sure I'm not unplugging-replugging the cables in many times. If I can have them plugged in and then keep them plugged in they will likely last longer.If you're looking for potential projects using these boards, there are a ton out there! Many open-source projects exist which require these 24-pin boards. If you like to solder and want some projects to use those skills with this would be a great place to start.I would recommend grabbing a board that uses a USB-C interface, but ultimately these are great microcontrollers on a budget, and a great place to start learning how to program and use them.

I bought these for a volume issue I had. I needed to purchase a new keyboard but it had no volume buttons on it. I made a HID volume button from the use of one of these and already had my code ready. Plugged it in and set port, compatible board and uploaded without issue several times. Perfect product. A+++++

Super compact. Strong. Usb serial got a bit of getting used to when doing development as it reconnects with each flashing. Glad they removed the reset button as it protrudes. Doesn’t get much above 30C/85F. No issue yet needing to reboot it or pins in a bad state.

All four boards were used. They had lopped off wires and pins still soldered in. 2 had working code on them. 1 isn't recognized and gets really hot, it's clearly defective. Not great.